#include "stdio.h"
#include "stdlib.h"

void Swap(int*, int*);

int main()
{
    int iVal1 = 5, iVal2 = 6;

    printf("before: a = %d, b = %d\n", iVal1, iVal2);

    Swap(&iVal1, &iVal2);

    printf("after: a = %d, b = %d\n", iVal1, iVal2);

    return 0;
}

void Swap(int* x, int* y)
{
    int temp;
    temp = *x;
    *x = *y;
    *y = temp;
}
